2N12: Complex Calcite crystal, with the dominant form of a scalenohedron and a flattened rhombohedron, transparent, bright, with a yellowish color and on a rocky matrix with little Calcite crystals.
La Florida mining area, Herrería-Valdáliga-Rionansa, Comarca Costa Occidental/Saja-Nansa, Cantabria  Spain (2008)

Specimen size: 6.0 × 4.2 × 3.8 cm = 2.36” × 1.65” × 1.50”

Main crystal size: 2.3 × 2.6 × 2.7 cm = 0.91” × 1.02” × 1.06”